MC44BC373/4C Просмотр технического описания (PDF) - Motorola => Freescale

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MC44BC373/4C

PLL-Tuned UHF and VHF Audio/Video High-Integration Modulator

Motorola => Freescale 

Characterization Measurement Conditions

Table 24. Measurement Conditions (continued)

Device and Signal Set-Up

Measurement Set-Up

Unweighted Video Signal to Noise

Same as above with CCIR filter disabled Same as above

Video Differential Phase

Video: 5-step grey scale, 1 Vp-p

No audio signal

This is measured using a Rohde & Schwarz

AMFS UHF demodulator in B/G (using a

CCIR Rec. 567 weighting network),

100-kHz to 5-MHz band with sound trap

and envelope detection, and a Rohde &

Schwarz UAF video analyzer.

On line CCIR 330, the video analyzer DP measure consists of calculating

the difference of the chroma phase at the black level and the different

chroma subcarrier phase angles at each step of the grey scale. The

largest positive or negative difference indicates the distortion.

Diff Phase =

Largest positive or negative difference

Phase at position 0

× 100%

The video analyzer method takes the worst step from the first 4 steps.

Video Differential Gain

Video: 5-step grey scale, 1 Vp-p

On line CCIR 330 shown below, the video analyzer DG measure consists

No audio signal

of calculating the difference of the chroma amplitude at the black level

This is measured using a Rohde & Schwarz and the different amplitudes at each step of the grey scale. The largest

AMFS UHF demodulator in B/G (using a positive or negative difference indicates the distortion.

CCIR Rec. 567 weighting network),

100-kHz to 5-MHz band with sound trap

and envelope detection, and a Rohde &

Schwarz UAF video analyzer.

No audio signal

Video: 10-step grey scale

1

3

5

0

2

4

5-Step Grey Scale with Chroma Subcarrier Superimposed

(Not to Scale), Line CCIR 330

Diff Gain =

Largest positive or negative difference

Amplitude at position zero

× 100%

The video analyzer method takes the worst step from the first 4 steps.

Video Modulation Depth

This is measured using an HP8596E spectrum analyzer with a TV trigger

option, allowing demodulation and triggering on any specified TV line.

The analyzer is centred on the maximum peak of the video signal and

reduced to 0 Hz span in linear mode to demodulate the video carrier

.

AA ((6m-10Vm)V)

BB(0(.6m- 3Vm)V)

TV Line Demodulated by Spectrum Analyzer—BG Standard

The modulation depth is calculated as (A – B) / A x 100 in percent.

Same measurement method for L standard, with inverted video.

20

MC44BS373CA Data Sheet

MOTOROLA

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